Tetraphenylpyrazine-Based Manganese Metal–Organic Framework as a Multifunctional Sensor for Cu²⁺, Cr³⁺, MnO₄^–, and 2,4,6-Trinitrophenol and the Construction of a Molecular Logical Gate

Abstract

A tetraimidazole-decorating tetraphenylpyrazine has been designed and utilized for the fabrication of a novel metal− organic framework (MOF), denoted as {Mn(Tipp (TippMn, where Tipp = 2,3,5,methyl]phenyl]pyrazine and A = deprotonation of 1,4-naphthalenedicarboxylic acid), through hydrothermal synthesis. Structural analysis reveals that TippMn possesses a 2-fold-interpenetrated 4,8-connected three-dimensional (3D) network with an unprecedented {4 16 •6 12 }{4 4 •6 2 } topology. Fluorescent spectral investigations indicate that TippMn shows discriminative fluorescence when treated by Cr 3+ and Cu 2+ , giving an INHIBIT logical gate performance. Meanwhile, TippMn can be further used as a sensor for MnO 4 − and 2,4,6-trinitrophenol (TNP) by fluorescence quenching. Notably, the sensing processes toward Cu 2+ , Cr 3+ , MnO 4 − , and TNP are labeled with high selectivity and sensitivity, quick response, and good recyclability. It is anticipated that this MOFbased versatile sensor could shed light on the exploration of MOFs for fluorescent sensors, optical switches, etc.

Multifunctional lanthanide MOF luminescent sensor built by structural designing and energy level regulation of a ligand

“…And the π-π stacking interactions between naphthalene groups belong to a parallel displaced conformation. 49 The distance between naphthalene groups ranges from 3.694 Å to 4.385 Å, which is in accordance with the reported data. It is not ignored that the "OvC-NH" groups between adjacent stable units are linked with H 2 O molecules and DMAC molecules by hydrogen bonding interactions (Fig.…”

“…Picric acid (PA) is one of the most dangerous nitro explosives, so it is necessary to detect PA selectively and quickly. [46][47][48][49] As PA has three nitro groups and one hydroxyl group, it is inferred that the Eu-MOF might recognize PA by hydrogen bonding interactions. This assumption was verified by the following experiment.…”

Coordination Polymers as a Functional Material for the Selective Molecular Recognition of Nitroaromatics and ipso‐Hydroxylation of Arylboronic Acids

“…As phenols are renowned versatile reaction intermediates in the synthesis of a diverse range of pharmaceutically and industrially important compounds. [33,75] Primarily, reaction conditions were optimized using phenylboronic acid as model substrate and varying the other reaction factors such as solvents, oxidizing agents, time and catalyst loading to get the better yield, and their results are summarized in Table 2. Among the screened solvents and oxidizing agents, H 2 O and CH 3 CN were found to be the best solvent and hydrogen peroxide (H 2 O 2 ) was determined to be an appropriate oxidizing agent (Entries 3 and 7) as in these conditions 99% yield was obtained only in 15 min with both catalyst 1 and 2.…”

Porous MB@Cd-MOF Obtained by Post-Modification: Self-Calibrated Fluorescent Turn-on Sensor for Highly Sensitive Detection of Carbaryl

“…First, as exhibited in Figure S13, the PXRD pattern of MB@Cd-MOF after the fluorescence experiment was the same as that of the as-synthesized MB@Cd-MOF, which ruled out that the fluorescence enhancement of MB@ Cd-MOF was caused by the structure collapse of MB@Cd-MOF. 41 Compared with other pesticides (Figure S14), the UV−vis absorption spectrum of carbaryl has the largest overlap with the fluorescence emission spectrum of MB@Cd-MOF, indicating that energy transfer is evident from carbaryl to MB@Cd-MOF, 42 which can also be confirmed by the enhanced fluorescence lifetime of MB@Cd-MOF after fluorescence sensing carbaryl (Figure S15). 43 In addition, the sizes of pesticides calculated by the CPK model are shown in Table S3.…”